Lawmakers have postponed a preliminary vote on a proposed requirement that President Barack Obama and other presidential candidates show their eligibility to run for the office by proving their citizenship.

The Arizona Senate is scheduled to take a preliminary vote Tuesday on a proposed requirement that President Barack Obama and other presidential candidates show their eligibility to run for the office by proving their citizenship.

Legislation requiring presidential candidates to submit proof of citizenship before appearing on the Arizona ballot is advancing in the Senate, though it has been stripped of its most controversial provision and has been substantially tweaked since the original version died in committee in February.